Mechanical movement for producing a differential speed between driving and driven members.



. M. LEITGH. MECHANICAL MOVEMENT VFOB. PRODUGING A DIFFERENTIAL SPEED BETWEEN DRIVING AND DBIVEN MEMBERS. APYLIOATION FILED 0012.24', 1910; RBNBWED 00T. za. 19.11.

Patented May 2i, 1912.

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BOLUMBIA PLANOGRAPH C0.. WASHINGTON. D. c.

y M. LBITGH.

MEGHANIGAL MOVEMENT FOR PRODUGING A DIFFERENTIAL SPEED BETWEEN DRIVING AND DRIVBN MEMBERS. APPLIOATION FILED 001.24, 1910. BENEWBD 001:.;23, 1911.

Patented' May 21, 1912.

3 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH Co..wAsHna1-0N.D.c.

v M. LEITGE.

` MECHANICAL MOVEMENT EOE TROEUGING A DIFFERENTIAL SPEED BETWEEN DRIVING I AND DEIVEN MEMBERS.

APPLICATION IIIIED 00T. 24, 1910. RENEWEDOOT. 23, 191].

1,027,1 34. Patented May 21, 19.12.

3 SHEETS-SHEET 3.

W/T/VESSES: [NVE/V705 5%@- r ME ATTORNEYS COLUMBIA PLANQGRAPH co., wASHlNGToN. n. c.

the inachine. 35

UNITED STATES PATENT OFFICE. MEREDITH LEITCH, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR J.

AREND, OF NEW YORK, N. Y., AND JOHN BERNSTROM, OF STOCKHOLM,

` MECHANICAL MOVEMENT 'FOR PRODUCING A DIFFERENTIAL SPEED yBETWEEN DRIVING AND 'DRIVEN MEMBERS.

Applicaton'led October 24, 1910, Serial No. 588,590. Renewed October 23, 1911.

To all whom it may concern:

Be it known that I, MEREDITH LErrcH, a citizen of the United States, residing at Springfield, county of Hampden, and State of Massachusetts, haveV invented anew and useful Improvement in Mechanical Move-.

ments'for Producing a Differential `Speed Between Driving and Driven Members, of which: the following is a full, clear, and exact description, reference being had to they accompanying drawings, which form a part of this specificationt My invention is particularly adapted for use in that classl of continuous centrifugal machines for the separation of solids and liquids, which comprises a revolving cylinder in which the separation takes place, through which the liquid orfsemi-liquid passes in one direction. Intheinterior of the cylinder are conveyers or scraperswhich areV revolved at a differential speed from that of the cylinder. My invention is applicable tov driving the conveyer or-scrapers in this manner from the cylinder.

I will first describeV the embodiment of my invention illustrated in thev accompanying drawings, in which this mechanical move-l ment is used with such a centrifugal machine as has just been described.

In the drawings: Figure 1 is a longitudinalsection of a continuous solid liquid centrifugal separator elnbodying my invention; Fig. 2 is an end view ofthe lefty hand end of Fig. 3 n is a section on line 3-,-3, Fig. 1. Fig. 4:k is an end view yof the right hand end of the machine of Fig. 1. C is the revolving cylindrical casing of the centrifugal separator having the heads B and B. The hollow shaft A for rotating the cylinder is rigidly attached to the cylinderhead B. l Y 1 D is a ratchet` wheel, rigidly mounted on the cylinder head B, and therefore' revolves at the same speed as the cylinder C;

v F is the shaft carrying the conveyer F. Keyed to this shaft F is the fulcrum disk E, having hub E on the outside of which is mounted the hub G of the cylinder headv B.

Specicaton of Letters Patent. l

PatentedMay 21, 1912.

serial No. 656,081.

mounted in the bearing support P so` as not to be rotatable, it is, however, supported by the rod R and the weighted lever N so that eccentricity may be decreased by lifting of the lever N, or when too great downward pressure is exerted by the shoes K as they revolve.

In the revolution of the cylinder thein-V ner ends of the levers have an oscillating movement, which causes the pawl incontact with the face of one of the ratchet teeth to exert pressure against the tooth. This force causes the fulcrum pin inwhich thelever is mounted to advance and the diskE and conveyer to revolve with relation to the cylinder C. The effort of'each lever and pawl movement is to cause lthis rotating effect during half a revolution, that is 180 degrees. There being three levers, however, the work v must be divided up between the' three pawls and the result is :that each; pawl exerts through 120 degrees, the final result being that the rotating movement of the conveyer is practically constant and there is no shock when the advancing pawl comes in Contact with the tooth. y

v Should the conveyer screw become bound in the cylinder from any cause as for instance too rapid feeding of the machines, the ratchet driving mechanism will'rnot be broken as would be the case withthe gears, but would cease to operate. The pressure of the shoes K on the eccentric would force it to a more concentric position andthe levers` would not oscillate sufficiently to carryV Y duce or shut ofi7 entirely the supply of raw material and consequently the output of the machines would be unaffected. To start the conveyer again, pressure applied by hand to the lever will again bring the eccentric to full stroke, and consequently cause the conveyer to again rotate with relation tothe cylinder. This being done the eed may again be restored.

In the machine shown, the material a mixture of solids and liquid is fed into the inlet l on the right hand head of the apparatus. The liquid passes to the left hand end, and the solids through the action of the conveyers, are carried to the right hand end. The liquids pass out in the direction of the arrow 2 into the passage 5 leading to the chamber 3 which communicates with t-he outlet 4. Thesolids pass in the direction of the arrow 6 into and through the passage 7 into the chamber 8 in communication with the solids outlet 9.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. As a mechanical movement, in combination, rotatable driving and driven members, one of said members carrying a ratchet, the other carrying a fulcrum support, one or more levers ulcrumed on said support, and an eccentric with reference to which said driving and driven members rotate, said levers provided with means for coaction with said ratchet and with means for coaction with said eccentric.

2. As a mechanical movement, in combination, rotatable driving and driven members, one of said members carrying a ratchet, the other carrying a fulcrum sup-port, one or more levers fulcrumed on said support, an eccentric of variable throw and with reiference to which said driving and driven members rotate, said levers provided with means for coaction with said ratchet and with means for coaction with said eccentric, and means acting on said eccentric tending to counteract the tendency of said levers to vary the throw of such eccentric.

3. As a mechanical movement, in combination, rotatable driving and driven mem bers, having a common axis of rotation, and power-transmitting mechanism for causing said driven member to rotate with reference to the driving member and comprising disengaging means, controlled by the resistance against which said driven member rotates with reference to the driving member, and arranged to check transmission of power through such mechanism from the driving to the driven member when such resistance becomes excessive.

4. As a mechanical movement, in combination, a rotating driving member carrying a ratchet, a driven member, carrying a fulcrum disk, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, shoes carried by said levers on the opposite side of said fulcrum, and a nonrotatable eccentric with which said shoes contact.

5. As a mechanical movement, in combination, a rotating driving member carrying a ratchet, a driven member, carrying a fulcrum disk, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, a non-rotatable eccentric with which the levers, on the side of the fulcrum opposite to that of the pawls, contact.

6. As a mechanical movement, in combination, a rotating driving member carrying a ratchet, a driven member, carrying a fulcrum disk, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, shoes carried by said levers on the opposite side of said fulcrum, and a nonrotatable but vertically movably supported eccentric with which said shoes contact.

7. As a mechanical movement, in combination, a rotating driving member carrying a ratchet, a driven member, carrying a fulcrum disk, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, a non-rotatable but vertically movably supported eccentric with which the levers, on the side of the ulcrum opposite to that of the pawls, contact.

8. In combination, a rotatable cylinder, a conveyer within said cylinder, a ratchet rotating with said cylinder, a fulcrum disk operatively connected with said conveyer, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, shoes carried by said levers on the opposite side of said ulcrum, and a non-rotatable eccentric with which said shoes contact.

9. In combination, a rotatable cylinder, a conveyer within said cylinder, a ratchet rotating with said cylinder, a ulcrum disk operatively connected with said conveyer, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, a non-rotatable eccentric with which the levers on the side of the fulcrum, opposite to that of the pawls, contact.

10. In combination, a rotatable cylinder, a conveyer within said cylinder, a ratchet rotating wit-h said cylinder, a ulcrum disk operati'vely connected with said conveyer, levers fulcrumed on said disk, pawls carried by said levers coacting with said ratchet, shoes carried byV said levers on the opposite side of said fulcrum, and a non-rotatable but vertically movably supported eccentric with which said shoes contact.

11. In combination, a rotatable cylinder, a conveyer within said cylinder, a ratchet rotating with said cylinder, a fulcrum disk operatively connected with said conveyer,

levers fulcrumed on said disk, pawls carried hereunto set my hand, at Springfield, Mass., by said levers coacting Wilth said ratchet, a on this first day of October, 1910. non-rotatable but vertica 1y movably supported eccentric With which the levers on MEREDITH LEITCH 5 the side of the fulcrum, opposite te that of /Vitnesses:

the paWls, Contact. C. W. WEBB,

In testimony of Which invention, I have F. K. F EARNSIDE.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents,

f Washington, D. C. 

